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Russian Journal of Applied Chemistry, Vol. 76, No. 2, 2003, pp. 325!327. Translated from Zhurnal Prikladnoi Khimii, Vol. 76, No. 2, 2003,
Original Russian Text Copyright + 2003 by Zorin, Plastinin, Smirnov.
A Mass-Spectrometric Study of Gaseous Products
of Thermal Desorption from Diamond and Graphite
B. Ya. Zorin, S. Yu. Plastinin, and E. P. Smirnov
St. Petersburg State Technological Institute, St. Petersburg, Russia
Received January 10, 2002
Abstract-The method of thermal desorption in a vacuum, with gaseous products recorded by mass-spec-
trometry, was applied to study the state of the surface of diamond and graphite.
Diamond and graphite are carbon materials wide-
ly used in various fields of science and technology.
Studying the state of the surface of these materials is
of scientific and practical importance.
It has been established by numerous studies using
chemical and physicochemical analytical techniques
that, when interacting with the surface of diamond
and graphite, oxygen forms various functional oxy
groups: hydroxy, carboxy, carbonyl, ester and ether,
etc. [1, 2].
Fig. 1. Thermal desorption spectra of (a) AM-3 diamond
and (b) GSM-5 graphite. (I) Intensity of molecular ion peaks
O, CO, CO
) and (T) temperature; the same for Fig. 2.
O, (2) CO, and (3)CO
; the same for Fig. 2.
The aim of the present study was to determine the
thermal stability of the functional oxy groups of dia-
mond and graphite by analyzing the gaseous products
evolved in linear heating of diamond and graphite,
with these products recorded simultaneously by mass-
Thermal desorption spectra (Figs. 1 and 2) were
obtained by plotting envelopes in the coordinates
molecular ion peak intensity3temperature.
Fig. 2. Thermal desorption spectrum of (a) GSM-5 graphite
modified with sodium ions and (b) AM-3 diamond mod-
ified with titanium oxide.